potter



(No Model.) 2 Sheets-Sheet 1.

J. L. POTTER. TRENGH MACHINE.

No. 550,690. Patented Dec. 3, 1895.

i K Ta II II W/TNSSES.

Burtaw.

ANDREW EGRANAM FHOTD-UTHQWASHINGTDMIIC (No Model.) 2 Sheets-Sheet 2.

J.L.POTTER.

-"I'RENGH MACHINE.

No. 550,690. PatentedDec. 3, 1895.

WITNESSES; INVENTOH M g. W

A TTOHNE Y.

AN DREW BBRAHAM. FHOTOUTHO. WASHINGTDNJKI.

UNITED STATES 3 PATENT OFFICE.

JOSEPH L. POTTER, OF INDIANAPOLIS, INDIANA.

TRENCH-MACHINE.

srnorrion'rron'ferin ng part of Letters Patent No. 550,690, datedDecember 3, 1895. Application filed. February 4., 1895. Serial No.537,249. (No model.)

- such as will enable others skilled in the art to which it appertainsto make and use the same, reference being had to the accompany ingdrawings, and to the letters of reference marked thereon, which form apart of this specification.

My invention relates to that form of tren chmachines for which LettersPatent were granted to me on August 21, 1894, numbered 524,7 31.

My improvement consists in the hoisting mechanism whereby the capacityof the machine is increased.

Reference is had to the accompanying drawings, which form a part of thisspecification, in which similar letters of reference indicate the sameparts throughout the several views.

Figure 1 is a side elevation. Fig. 2 is an end elevation. Fig. 3 shows aslight modification of my invention operating a series of buckets. Fig.4 shows a modification of my invention with the buckets operated wit-h asprocket and chain.

In the drawings, A refers to the horizontal traveling superstructurewhich travels on the rails on the sleeperB.

C is the frame of the carriage and can be made of any suitable materialand is provided with the wheels D, which are secured to the axles E. Fisthe axle-boxes. This carriage travels longitudinally on the track G.

H is the main shaft and has bearings in the boxes I and is provided withthe large drum J and the small drums K and K and the ratchet-Wheel L.

N and N are the ratchet-wheel pawls, which are pivoted to the beam at nand 12, respectively. The pawl N is to be engaged when the tub israising for safety, and the pawl N is to be engaged only whenthecarriage is to travel.

M is the rope or cable with one end at= tached to the drum of thehoisting-engine not shown) and passes up and over the pulley 0, thenover the pulley 0, then down and over the pulley 0 then over the pulley0 then upward and over the pulley O and then fastened to the main drumJ. This cable M moves the carriage longitudinally to the right when theratchet-wheel L is locked by simply running the drum of the engine andwill raise or lower the tubs when the ratchet is released by running theengine in either direction.

The rope or cable P is attached to one of the drums of the engine andthe opposite end is attached to the eyebolt P on the carriage. Thiscable is to pull the carriage to the left, when desired.

It is understood that the two drums of the engine are loose on the shaftand are only operated when the friction-levers (not shown) are engagedtherewith.

R and R arethe ropes or cables, with one end fastened to the drums K andK, respectively, then passing over the pulleys S S, re-

spectively, then extending down for a suitable length and the other endattached to the handles on the tubs T and T, respectively. This cable isintended to raise and lower said tubs.

Referring to Fig. 3, I have shown a modification, where a series of tubscan be raised at one time by simply extending the number of pulleys Sand using, a hook-block U, as shown. The end of the tub-cable isfastened to the shaft at U. Fig. 4 shows a further modification. Thesprocket-wheelV is operated by the sprocket-chain WV, which is driven bythe sprocket-wheel 'W on the main shaft. This operates the tub-drum Y,which raises or lowers the tubs.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. In combination, the movable trestle, the movable frame mountedthereon, the shaft jonrnaled in said frame, the main and sup plementaldrums carried on said shaft, the buckets, connecting means for saidbuckets to the supplemental drum, and the single draft rope for eitheradvancing said frame or raising said buckets, substantially as described.

2. In a trench machine, the combination with the movable trestle andcarriage, of a main drum journaled in said carriage, pulleys alsojournaled in said carriage on each side of said drum, ropes operatedthrough the said drum connected at their outer ends to the outer pulleysand the tubs swung upon said ropes between each pair of pulleys,substantially as described.

3. In a trench machine, in combination with the movable trestle andcarriage, of a shaft journaled in said carriage, the main andsupplemental drums mounted thereon a pluralityof pulleys j ournaled oneach side of said drums in said carriage, ropes secured to saidsupplemental drums at one end, then passing' over the intermediatepulleys and se cured at their opposite ends to the outer pulleys and thebuckets moving from said ropes between each pair of pulleys,substantially as described.

I11 testimony whereof I affix my signature in presence of two witnesses.

, JOSEPH L. POTTER. WVitnesses:

WATT. P. DENNY, A. A. GHAPIN.

